<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    const arrayLike = {0:'start',1:'a',2:'b',3:'c',length:4}
    console.log(Array.from(arrayLike))
    console.log(Array.from(arrayLike,x=>x.toUpperCase()))
    console.log(Array.prototype.slice.call(arrayLike))
</script>
</html>